CN115260865A - Aqueous epoxy coating composition - Google Patents
Aqueous epoxy coating composition Download PDFInfo
- Publication number
- CN115260865A CN115260865A CN202210442969.9A CN202210442969A CN115260865A CN 115260865 A CN115260865 A CN 115260865A CN 202210442969 A CN202210442969 A CN 202210442969A CN 115260865 A CN115260865 A CN 115260865A
- Authority
- CN
- China
- Prior art keywords
- epoxy resin
- epoxy
- coating film
- coating
- weight
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000008199 coating composition Substances 0.000 title claims abstract description 40
- 229920006334 epoxy coating Polymers 0.000 title claims abstract description 31
- 239000003822 epoxy resin Substances 0.000 claims abstract description 103
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 103
- 229920002554 vinyl polymer Polymers 0.000 claims abstract description 28
- 230000009477 glass transition Effects 0.000 claims abstract description 26
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 23
- 150000001412 amines Chemical class 0.000 claims abstract description 17
- 229920001281 polyalkylene Polymers 0.000 claims abstract description 6
- -1 amine compound Chemical class 0.000 claims description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 26
- 239000004593 Epoxy Substances 0.000 claims description 23
- 229920006122 polyamide resin Polymers 0.000 claims description 22
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 claims description 8
- 238000000576 coating method Methods 0.000 description 122
- 239000011248 coating agent Substances 0.000 description 117
- 239000000203 mixture Substances 0.000 description 32
- 239000000049 pigment Substances 0.000 description 32
- 238000001035 drying Methods 0.000 description 28
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 24
- 239000003973 paint Substances 0.000 description 17
- 238000012360 testing method Methods 0.000 description 17
- 239000000463 material Substances 0.000 description 16
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 14
- 229920005989 resin Polymers 0.000 description 14
- 239000011347 resin Substances 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 13
- 230000002401 inhibitory effect Effects 0.000 description 12
- 150000001875 compounds Chemical class 0.000 description 11
- 230000000704 physical effect Effects 0.000 description 11
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 9
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 9
- 229910052739 hydrogen Inorganic materials 0.000 description 9
- 239000001257 hydrogen Substances 0.000 description 9
- 239000007787 solid Substances 0.000 description 9
- 238000003860 storage Methods 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 229920001515 polyalkylene glycol Polymers 0.000 description 7
- 238000001556 precipitation Methods 0.000 description 7
- 239000002904 solvent Substances 0.000 description 7
- 239000004606 Fillers/Extenders Substances 0.000 description 6
- 238000004040 coloring Methods 0.000 description 6
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 6
- 239000003960 organic solvent Substances 0.000 description 6
- 239000012855 volatile organic compound Substances 0.000 description 6
- 239000002253 acid Substances 0.000 description 5
- 229920000768 polyamine Polymers 0.000 description 5
- 239000007921 spray Substances 0.000 description 5
- POAOYUHQDCAZBD-UHFFFAOYSA-N 2-butoxyethanol Chemical compound CCCCOCCO POAOYUHQDCAZBD-UHFFFAOYSA-N 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 4
- 239000000654 additive Substances 0.000 description 4
- PXKLMJQFEQBVLD-UHFFFAOYSA-N bisphenol F Chemical compound C1=CC(O)=CC=C1CC1=CC=C(O)C=C1 PXKLMJQFEQBVLD-UHFFFAOYSA-N 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 4
- 229920003986 novolac Polymers 0.000 description 4
- CUVLMZNMSPJDON-UHFFFAOYSA-N 1-(1-butoxypropan-2-yloxy)propan-2-ol Chemical compound CCCCOCC(C)OCC(C)O CUVLMZNMSPJDON-UHFFFAOYSA-N 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 3
- 239000000539 dimer Substances 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 238000010422 painting Methods 0.000 description 3
- 238000005191 phase separation Methods 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 239000012463 white pigment Substances 0.000 description 3
- MUTGBJKUEZFXGO-OLQVQODUSA-N (3as,7ar)-3a,4,5,6,7,7a-hexahydro-2-benzofuran-1,3-dione Chemical compound C1CCC[C@@H]2C(=O)OC(=O)[C@@H]21 MUTGBJKUEZFXGO-OLQVQODUSA-N 0.000 description 2
- OAYXUHPQHDHDDZ-UHFFFAOYSA-N 2-(2-butoxyethoxy)ethanol Chemical compound CCCCOCCOCCO OAYXUHPQHDHDDZ-UHFFFAOYSA-N 0.000 description 2
- WMDZKDKPYCNCDZ-UHFFFAOYSA-N 2-(2-butoxypropoxy)propan-1-ol Chemical compound CCCCOC(C)COC(C)CO WMDZKDKPYCNCDZ-UHFFFAOYSA-N 0.000 description 2
- HZAXFHJVJLSVMW-UHFFFAOYSA-N 2-Aminoethan-1-ol Chemical compound NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 description 2
- UPGSWASWQBLSKZ-UHFFFAOYSA-N 2-hexoxyethanol Chemical compound CCCCCCOCCO UPGSWASWQBLSKZ-UHFFFAOYSA-N 0.000 description 2
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 2
- PAYRUJLWNCNPSJ-UHFFFAOYSA-N Aniline Chemical compound NC1=CC=CC=C1 PAYRUJLWNCNPSJ-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- ROSDSFDQCJNGOL-UHFFFAOYSA-N Dimethylamine Chemical compound CNC ROSDSFDQCJNGOL-UHFFFAOYSA-N 0.000 description 2
- QUSNBJAOOMFDIB-UHFFFAOYSA-N Ethylamine Chemical compound CCN QUSNBJAOOMFDIB-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- BAVYZALUXZFZLV-UHFFFAOYSA-N Methylamine Chemical compound NC BAVYZALUXZFZLV-UHFFFAOYSA-N 0.000 description 2
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 2
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 2
- 125000003118 aryl group Chemical group 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 239000004841 bisphenol A epoxy resin Substances 0.000 description 2
- HQABUPZFAYXKJW-UHFFFAOYSA-N butan-1-amine Chemical compound CCCCN HQABUPZFAYXKJW-UHFFFAOYSA-N 0.000 description 2
- 125000004432 carbon atom Chemical group C* 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 229930003836 cresol Natural products 0.000 description 2
- PAFZNILMFXTMIY-UHFFFAOYSA-N cyclohexylamine Chemical compound NC1CCCCC1 PAFZNILMFXTMIY-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- JQVDAXLFBXTEQA-UHFFFAOYSA-N dibutylamine Chemical compound CCCCNCCCC JQVDAXLFBXTEQA-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 150000002148 esters Chemical class 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000005227 gel permeation chromatography Methods 0.000 description 2
- NAQMVNRVTILPCV-UHFFFAOYSA-N hexane-1,6-diamine Chemical compound NCCCCCCN NAQMVNRVTILPCV-UHFFFAOYSA-N 0.000 description 2
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000012948 isocyanate Substances 0.000 description 2
- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- BDJRBEYXGGNYIS-UHFFFAOYSA-N nonanedioic acid Chemical compound OC(=O)CCCCCCCC(O)=O BDJRBEYXGGNYIS-UHFFFAOYSA-N 0.000 description 2
- 230000003449 preventive effect Effects 0.000 description 2
- WGYKZJWCGVVSQN-UHFFFAOYSA-N propylamine Chemical compound CCCN WGYKZJWCGVVSQN-UHFFFAOYSA-N 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- CXMXRPHRNRROMY-UHFFFAOYSA-N sebacic acid Chemical compound OC(=O)CCCCCCCCC(O)=O CXMXRPHRNRROMY-UHFFFAOYSA-N 0.000 description 2
- TYFQFVWCELRYAO-UHFFFAOYSA-N suberic acid Chemical compound OC(=O)CCCCCCC(O)=O TYFQFVWCELRYAO-UHFFFAOYSA-N 0.000 description 2
- 239000004408 titanium dioxide Substances 0.000 description 2
- 238000004448 titration Methods 0.000 description 2
- 238000009736 wetting Methods 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- OTJFQRMIRKXXRS-UHFFFAOYSA-N (hydroxymethylamino)methanol Chemical compound OCNCO OTJFQRMIRKXXRS-UHFFFAOYSA-N 0.000 description 1
- KCFTYNYWGLBFSZ-UHFFFAOYSA-N 1-methoxypropan-1-ol Chemical compound COC(CC)O.COC(CC)O KCFTYNYWGLBFSZ-UHFFFAOYSA-N 0.000 description 1
- STMDPCBYJCIZOD-UHFFFAOYSA-N 2-(2,4-dinitroanilino)-4-methylpentanoic acid Chemical compound CC(C)CC(C(O)=O)NC1=CC=C([N+]([O-])=O)C=C1[N+]([O-])=O STMDPCBYJCIZOD-UHFFFAOYSA-N 0.000 description 1
- YSUQLAYJZDEMOT-UHFFFAOYSA-N 2-(butoxymethyl)oxirane Chemical compound CCCCOCC1CO1 YSUQLAYJZDEMOT-UHFFFAOYSA-N 0.000 description 1
- JPEGUDKOYOIOOP-UHFFFAOYSA-N 2-(hexoxymethyl)oxirane Chemical compound CCCCCCOCC1CO1 JPEGUDKOYOIOOP-UHFFFAOYSA-N 0.000 description 1
- HHRACYLRBOUBKM-UHFFFAOYSA-N 2-[(4-tert-butylphenoxy)methyl]oxirane Chemical compound C1=CC(C(C)(C)C)=CC=C1OCC1OC1 HHRACYLRBOUBKM-UHFFFAOYSA-N 0.000 description 1
- ZPXGNBIFHQKREO-UHFFFAOYSA-N 2-chloroterephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C(Cl)=C1 ZPXGNBIFHQKREO-UHFFFAOYSA-N 0.000 description 1
- HNNQYHFROJDYHQ-UHFFFAOYSA-N 3-(4-ethylcyclohexyl)propanoic acid 3-(3-ethylcyclopentyl)propanoic acid Chemical compound CCC1CCC(CCC(O)=O)C1.CCC1CCC(CCC(O)=O)CC1 HNNQYHFROJDYHQ-UHFFFAOYSA-N 0.000 description 1
- RNLHGQLZWXBQNY-UHFFFAOYSA-N 3-(aminomethyl)-3,5,5-trimethylcyclohexan-1-amine Chemical compound CC1(C)CC(N)CC(C)(CN)C1 RNLHGQLZWXBQNY-UHFFFAOYSA-N 0.000 description 1
- PMZBHPUNQNKBOA-UHFFFAOYSA-N 5-methylbenzene-1,3-dicarboxylic acid Chemical compound CC1=CC(C(O)=O)=CC(C(O)=O)=C1 PMZBHPUNQNKBOA-UHFFFAOYSA-N 0.000 description 1
- MWSKJDNQKGCKPA-UHFFFAOYSA-N 6-methyl-3a,4,5,7a-tetrahydro-2-benzofuran-1,3-dione Chemical compound C1CC(C)=CC2C(=O)OC(=O)C12 MWSKJDNQKGCKPA-UHFFFAOYSA-N 0.000 description 1
- 229930185605 Bisphenol Natural products 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- RPNUMPOLZDHAAY-UHFFFAOYSA-N Diethylenetriamine Chemical compound NCCNCCN RPNUMPOLZDHAAY-UHFFFAOYSA-N 0.000 description 1
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 1
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 description 1
- FQYUMYWMJTYZTK-UHFFFAOYSA-N Phenyl glycidyl ether Chemical compound C1OC1COC1=CC=CC=C1 FQYUMYWMJTYZTK-UHFFFAOYSA-N 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- WUGQZFFCHPXWKQ-UHFFFAOYSA-N Propanolamine Chemical compound NCCCO WUGQZFFCHPXWKQ-UHFFFAOYSA-N 0.000 description 1
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical compound CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000001361 adipic acid Substances 0.000 description 1
- 235000011037 adipic acid Nutrition 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 125000001931 aliphatic group Chemical group 0.000 description 1
- ILRRQNADMUWWFW-UHFFFAOYSA-K aluminium phosphate Chemical compound O1[Al]2OP1(=O)O2 ILRRQNADMUWWFW-UHFFFAOYSA-K 0.000 description 1
- MHLMPARDYWGGLE-UHFFFAOYSA-K aluminum;zinc;phosphate Chemical compound [Al+3].[Zn+2].[O-]P([O-])([O-])=O MHLMPARDYWGGLE-UHFFFAOYSA-K 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- 235000019270 ammonium chloride Nutrition 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 239000001055 blue pigment Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- FUFJGUQYACFECW-UHFFFAOYSA-L calcium hydrogenphosphate Chemical compound [Ca+2].OP([O-])([O-])=O FUFJGUQYACFECW-UHFFFAOYSA-L 0.000 description 1
- 239000001506 calcium phosphate Substances 0.000 description 1
- 229910000389 calcium phosphate Inorganic materials 0.000 description 1
- 235000011010 calcium phosphates Nutrition 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 235000019700 dicalcium phosphate Nutrition 0.000 description 1
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 description 1
- HPNMFZURTQLUMO-UHFFFAOYSA-N diethylamine Chemical compound CCNCC HPNMFZURTQLUMO-UHFFFAOYSA-N 0.000 description 1
- 229940028356 diethylene glycol monobutyl ether Drugs 0.000 description 1
- 238000000113 differential scanning calorimetry Methods 0.000 description 1
- WEHWNAOGRSTTBQ-UHFFFAOYSA-N dipropylamine Chemical compound CCCNCCC WEHWNAOGRSTTBQ-UHFFFAOYSA-N 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 125000000623 heterocyclic group Chemical group 0.000 description 1
- ACCCMOQWYVYDOT-UHFFFAOYSA-N hexane-1,1-diol Chemical compound CCCCCC(O)O ACCCMOQWYVYDOT-UHFFFAOYSA-N 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- PXSXRABJBXYMFT-UHFFFAOYSA-N n-hexylhexan-1-amine Chemical compound CCCCCCNCCCCCC PXSXRABJBXYMFT-UHFFFAOYSA-N 0.000 description 1
- JACMPVXHEARCBO-UHFFFAOYSA-N n-pentylpentan-1-amine Chemical compound CCCCCNCCCCC JACMPVXHEARCBO-UHFFFAOYSA-N 0.000 description 1
- JCGNDDUYTRNOFT-UHFFFAOYSA-N oxolane-2,4-dione Chemical compound O=C1COC(=O)C1 JCGNDDUYTRNOFT-UHFFFAOYSA-N 0.000 description 1
- 239000003002 pH adjusting agent Substances 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229920001748 polybutylene Polymers 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 229920001451 polypropylene glycol Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- USGIERNETOEMNR-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO.CCCO USGIERNETOEMNR-UHFFFAOYSA-N 0.000 description 1
- AOHJOMMDDJHIJH-UHFFFAOYSA-N propylenediamine Chemical compound CC(N)CN AOHJOMMDDJHIJH-UHFFFAOYSA-N 0.000 description 1
- 239000001054 red pigment Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000000518 rheometry Methods 0.000 description 1
- 238000005488 sandblasting Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- OHOBJYLZBONBBA-UHFFFAOYSA-N strontium zinc Chemical compound [Zn+2].[Sr+2] OHOBJYLZBONBBA-UHFFFAOYSA-N 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 1
- GPTWCNIDKQZDFF-UHFFFAOYSA-H trizinc;diphosphate;hydrate Chemical compound O.[Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O GPTWCNIDKQZDFF-UHFFFAOYSA-H 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
- 239000001052 yellow pigment Substances 0.000 description 1
- LRXTYHSAJDENHV-UHFFFAOYSA-H zinc phosphate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LRXTYHSAJDENHV-UHFFFAOYSA-H 0.000 description 1
- 229910000165 zinc phosphate Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/17—Amines; Quaternary ammonium compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L79/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen with or without oxygen or carbon only, not provided for in groups C08L61/00 - C08L77/00
- C08L79/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
- C08L79/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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Abstract
The present invention relates to an aqueous epoxy coating composition comprising a first epoxy resin, a second epoxy resin, a vinyl aromatic oligomer, and an amine-based curing agent, wherein the first epoxy resin has a glass transition temperature of 20 to 40 ℃, and the second epoxy resin comprises a polyalkylene glycol-modified epoxy resin having a glass transition temperature of-10 to-1 ℃.
Description
Technical Field
The present invention relates to a water-based epoxy coating composition which can be quickly dried and quickly cured at room temperature, is suitable for outdoor (exterior) coating, and has excellent storage stability, suitable pot life and excellent workability.
Background
Recently, with the strengthening of environmental regulations in various countries, there is an increasing demand for environmentally friendly coatings such as the regulation of the content of Volatile Organic Compounds (VOC) in the coatings, and water-based coatings that replace oil-based coatings are being actively developed. Particularly, in china occupying 95% or more of the container production capacity worldwide, the paint used inside the production line started to be completely changed to a water-based paint in 2016 by 7 months, with the government's strong environmental regulations. The water-based paints inside the production line are generally classified into exterior specifications for painting with zinc epoxy undercoats, epoxy intercoats, and acrylic topcoat paints, and interior specifications for painting with zinc epoxy undercoats and epoxy topcoat paints. For example, korean laid-open patent No. 2013-0081047 (patent document 1) discloses a two-component primer composition comprising: the primer main agent comprises low-viscosity liquid modified bisphenol A epoxy resin and high-viscosity liquid bisphenol A epoxy resin; and an amine curing agent.
However, most of the conventional water-based paints are limited to painting in an indoor production line environment, and the applicable range is limited. For example, in a container maintenance paint applied in an open air (outside) field, an oil paint has been used because of the restriction that drying conditions cannot be manually set.
Therefore, there is a need for research and development of an aqueous coating material which can be quickly dried and quickly cured at normal temperature, is suitable for outdoor (exterior) coating, has quality equivalent to that of conventional oil-based coating materials, and is environmentally friendly.
(Prior art document)
(patent literature)
Patent document 1: korean laid-open patent No. 2013-0081047 (published date: 2013.7.16).
Disclosure of Invention
(problems to be solved by the invention)
Accordingly, the present invention provides an epoxy coating composition which is quick-drying and quick-curing at normal temperature, is suitable for outdoor (exterior) coating, has excellent storage stability, can be used for a suitable period of time, has excellent workability, and is water-based and therefore environmentally friendly.
(measures taken to solve the problems)
The invention provides a water-based epoxy coating composition, which comprises a first epoxy resin, a second epoxy resin, a vinyl aromatic oligomer and an amine curing agent, wherein the glass transition temperature of the first epoxy resin is 20-40 ℃, and the glass transition temperature of the second epoxy resin comprises a polyalkylene glycol modified epoxy resin with the glass transition temperature of-10-1 ℃.
(Effect of the invention)
The water-based epoxy coating composition of the present invention can be quickly dried and quickly cured at room temperature, is suitable for outdoor (exterior) coating, and has appropriate pot life, excellent workability, and excellent storage stability.
In addition, the coating film prepared using the above epoxy coating composition is excellent in mechanical properties such as adhesion, impact resistance, rust prevention and wear resistance.
Detailed Description
The present invention will be described in detail below.
In the present invention, the value of the functional group such as "epoxy equivalent" can be measured by a method known in the art, and for example, may be a value measured by a titration (titration) method or the like.
In addition, in the present invention, the "glass transition temperature" of the resin is measured by a conventional method known in the art, for example, by Differential Scanning Calorimetry (DSC) or the like.
In the present invention, the "weight average molecular weight" of the resin may be measured by a method known in the art, and may be a value measured by a method such as GPC (gel permeation chromatography).
The aqueous epoxy coating composition of the present invention comprises a first epoxy resin, a second epoxy resin, a vinyl aromatic oligomer, and an amine-based curing agent. The first epoxy resin and the second epoxy resin have different glass transition temperatures, and as described above, when a resin having a relatively high glass transition temperature is used, the drying property is excellent, and when a resin having a relatively low glass transition temperature is used, the appearance is excellent, so that the coating can be performed also at normal temperature of the outside air environment.
A first epoxy resin
The first epoxy resin is a main resin of the epoxy coating composition, and reacts with an amine-based curing agent to form a coating film, thereby improving the characteristics of the coating film, such as quick-drying and quick-curing properties at normal temperature. Specifically, the first epoxy resin has a higher glass transition temperature than the second epoxy resin, thereby making the coating film hard and shortening the surface drying time when the coating operation is performed in an external environment.
Examples of the first epoxy resin include bisphenol a type epoxy resins, bisphenol F type epoxy resins, phenol novolac type (novolac) epoxy resins, cresol modified epoxy resins, acrylic modified epoxy resins, isocyanate modified epoxy resins, rubber modified epoxy resins, and the like. Specifically, the first epoxy resin may be an unmodified bisphenol a type epoxy resin.
In addition, the Epoxy Equivalent Weight (EEW) of the first epoxy resin may be 800 to 1200g/eq or 900 to 1100g/eq. When the epoxy equivalent of the first epoxy resin is less than the above range, the density of the coating film cured after coating may be reduced, and the rust inhibitive performance of the coating film produced may be deteriorated. When the epoxy equivalent of the first epoxy resin exceeds the above range, the viscosity of the composition increases, the spreadability is deteriorated, the coating film is not uniformly formed, and it is difficult to form a smooth coating film appearance.
The glass transition temperature (Tg) of the above first epoxy resin may be 20 to 40 ℃ or 28 to 33 ℃. When the glass transition temperature of the first epoxy resin is lower than the above range, the drying of the coating film becomes slow and the coating film shows soft (soft) characteristics, and when the glass transition temperature of the first epoxy resin exceeds the above range, the coating film is dried quickly and instead is dried before the coating film is not completely formed, and there is a possibility that the appearance of the coating film is poor and the coating film is hard (hard).
In addition, the first epoxy resin may be in the form of an aqueous dispersion having a solid content (NV) of 50 to 65 wt% relative to the total weight of the resin. When the solid content of the first epoxy resin is less than the above range, it is difficult to design a final paint product with a High solid content (High solid), and therefore, there is a problem that the film forming property of a coating film is lowered when the same amount of coating is applied, and when the solid content of the first epoxy resin exceeds the above range, the viscosity of the coating material increases, and there is a problem that it is difficult to ensure smooth workability of the final paint product.
The content of the first epoxy resin may be 15 to 35% by weight or 20 to 30% by weight with respect to the total weight of the epoxy resin composition. When the content of the first epoxy resin is less than the above range, the composition is not sufficiently quick-dried and cured at normal temperature, and normal-temperature curing cannot be performed, and when the content of the first epoxy resin exceeds the above range, there may be a problem that it is difficult to obtain a good spray pattern and a good appearance of a coating film.
Second epoxy resin
The second epoxy resin is a water-dispersible resin of the epoxy resin coating composition, and reacts with the amine-based curing agent to form a coating film, thereby adjusting the pot life (pot life) of the composition.
Examples of the second epoxy resin include bisphenol a type epoxy resins, bisphenol F type epoxy resins, phenol novolac type epoxy resins, cresol modified epoxy resins, acrylic modified epoxy resins, isocyanate modified epoxy resins, rubber modified epoxy resins, polyalkylene glycol modified epoxy resins, and the like. More specifically, the second epoxy resin may be a polyalkylene glycol-modified epoxy resin.
For example, when an unmodified bisphenol a-type epoxy resin is used as the above-mentioned first epoxy resin, the coating composition of the present invention comprises the unmodified bisphenol a-type epoxy resin and the polyalkylene glycol-modified epoxy resin. As described above, when the composition comprises the unmodified bisphenol a type epoxy resin and the polyalkylene glycol modified epoxy resin, a suitable viscosity can be formed in the coating preparation process, thereby smoothly preparing the coating.
Specifically, as described above, when a polyalkylene glycol-modified epoxy resin is used as the second epoxy resin, the hydrophilic property is adjusted by the hydrophilic group of the polyalkylene glycol resin, so that the compatibility in the mixture and the storage stability of the coating material can be improved, and when mixed with a curing agent, a working viscosity suitable for the field application of the coating material can be formed.
At this time, the monomer of the above polyalkylene glycol may have 2 to 5 or 2 to 4 carbon atoms. That is, the polyalkylene glycol may be specifically polyethylene glycol, polypropylene glycol or polybutylene glycol. As described above, when an epoxy resin modified with a polyalkylene glycol having a small number of carbon atoms is used as the second epoxy resin, the viscosity of the dispersion is lowered by increasing the hydrophilic group, thereby having a low particle size and a smooth dispersibility capable of securing the dispersibility required in the dispersion process for preparing the coating material.
The Epoxy Equivalent Weight (EEW) of the second epoxy resin may be 850 to 1250g/eq or 950 to 1150g/eq. When the epoxy equivalent of the second epoxy resin is less than the above range, the cured coating film may have low density and poor water resistance, and when the epoxy equivalent of the second epoxy resin exceeds the above range, the viscosity of the composition increases and the spreadability of the coating material deteriorates, and the coating film is not uniformly formed, making it difficult to form a smooth coating film appearance.
In addition, the glass transition temperature (Tg) of the above-mentioned second epoxy resin may be-10 to-1 ℃ or-5 to-1 ℃. When the glass transition temperature of the second epoxy resin is lower than the above range, there is a problem that the pot life is short, and when the glass transition temperature of the second epoxy resin exceeds the above range, the drying of the coating film is fast, and instead, there may occur a problem that the flexibility and the flow resistance of the coating film are lowered.
The hydroxyl value (OHV) of the second epoxy resin may be 100 to 200mgKOH/g or 130 to 180mgKOH/g. When the hydroxyl value of the second epoxy resin is less than the above range, there is a problem that the drying rate of the coating film is slow because of a small number of reactive groups that can react, and when the hydroxyl value of the second epoxy resin exceeds the above range, there is a problem that the pot life is shortened and the appearance of the coating film is poor because of a large number of reactive groups.
The second epoxy resin may be in the form of an aqueous dispersion having a solid content (NV) of 45 to 60 wt% relative to the total weight of the resin. When the solid content of the second epoxy resin is less than the above range, the viscosity may be reduced, there is a problem of a decrease in the anti-flowing property (anti), and when the solid content of the second epoxy resin exceeds the above range, the viscosity of the coating material increases, so that it is difficult to obtain a good spray pattern and a good appearance of the coating film.
The content of the above second epoxy resin may be 5 to 15% by weight or 8 to 12% by weight relative to the total weight of the epoxy resin composition. When the content of the second epoxy resin is less than the above range, the pot life of the composition is too short, and thus the working time is insufficient, resulting in poor workability, and when the content of the second epoxy resin exceeds the above range, the pot life becomes long, drying is slow, and there is a possibility that the working efficiency is lowered.
Vinyl aromatic oligomers
The vinyl aromatic hydrocarbon oligomer serves as an auxiliary resin for the epoxy coating composition, and serves to impart flexibility to the prepared coating film and to improve initial water resistance. Specifically, the above vinyl aromatic oligomer also exhibits the soft property of the resin itself in the coating film, thereby imparting flexibility to the prepared coating film, and exhibits the hydrophobic property of the resin on the surface of the formed coating film, thereby suppressing moisture penetration, enabling to improve the initial water resistance of the prepared coating film.
The vinyl aromatic oligomer refers to an aromatic oligomer containing a vinyl group.
The glass transition temperature (Tg) of the above-mentioned vinyl aromatic oligomer may be-5 to 6 ℃ or-3 to 4 ℃. When the glass transition temperature of the vinyl aromatic oligomer is lower than the above range, there is a possibility that the initial water resistance and the adhesion property are lowered on the surface of the formed coating film due to the characteristic that the drying of the resin itself is slowed, and when the glass transition temperature of the vinyl aromatic oligomer exceeds the above range, the drying of the resin is excessively promoted to advance the surface drying of the coating film, and there is a possibility that the smoothness (leveling property) of the coated coating material is lowered to deteriorate the appearance of the coating film.
In addition, the weight average molecular weight (Mw) of the vinyl aromatic oligomer may be 1000 to 2000g/mol. When the weight average molecular weight of the vinyl aromatic oligomer is less than the above range, there is a problem that drying of the coating film becomes slow, and when the weight average molecular weight of the vinyl aromatic oligomer exceeds the above range, there is a possibility that a problem of reduction in flexibility of the coating film occurs.
The hydroxyl group content of the vinyl aromatic oligomer may be 0.5 to 10.0% by weight or 1.0 to 8.0% by weight relative to the solid vinyl aromatic oligomer content. When the hydroxyl group content of the vinyl aromatic oligomer is less than the above range, there is a problem that drying of the coating film becomes slow, and when the hydroxyl group content of the vinyl aromatic oligomer exceeds the above range, there is a possibility that a storage property of the coating material is poor.
The vinyl aromatic oligomer may have a viscosity of 100 to 2500 mPas at 25 ℃. When the viscosity of the vinyl aromatic oligomer at 25 ℃ is less than the above range, there is a problem that the compatibility in the coating material is deteriorated, and when the viscosity of the vinyl aromatic oligomer at 25 ℃ exceeds the above range, there is a possibility that the viscosity of the coating material is excessively increased to deteriorate workability.
The content of the above vinyl aromatic oligomer may be 0.5 to 5% by weight or 0.5 to 2% by weight relative to the total weight of the epoxy resin composition. When the content of the vinyl aromatic oligomer is less than the above range, impact resistance and water resistance of the resulting coating film may be insufficient, and when the content of the vinyl aromatic oligomer exceeds the above range, a problem that drying of the coating film becomes slow may occur.
Amine curing agent
The amine curing agent reacts with the epoxy resin to cure the composition and form a coating film.
The amine curing agent may contain a polyamide resin and an epoxy-modified amine compound. In this case, the polyamide resin serves to improve the rheology of the resulting coating film. In addition, the epoxy-modified amine compound plays a role in improving the quick-drying and quick-curing properties of the composition at room temperature.
The polyamide resin can be prepared by reacting a dimer acid with a polyamine-based compound.
In this case, the dimer acid is not particularly limited as long as it is a dimer acid that can be usually used in the production of a polyamide resin, and examples thereof include adipic acid, suberic acid, sebacic acid, azelaic acid, terephthalic acid, isophthalic acid, 2-chloroterephthalic acid, 2-methyltriphthalic acid, 5-methylisophthalic acid, hexahydrophthalic anhydride (HHPA), naphthenic acid (naphthinic acid), and methyltetrahydrophthalic anhydride.
The polyamine-based compound may contain two or more amine groups in one molecule, and examples thereof include aliphatic polyamine-based compounds, aromatic polyamine-based compounds, and heterocyclic polyamine-based compounds.
The polyamide resin may have an Active Hydrogen Equivalent Weight (AHEW) of 100 to 180g/eq or 120 to 160g/eq. When the active hydrogen equivalent of the polyamide resin is less than the above range, there is a problem that rust inhibitive performance and impact resistance of the resulting coating film are lowered due to insufficient curing degree of the coating film, and when the active hydrogen equivalent of the polyamide resin exceeds the above range, the required amount of the polyamide resin for performing an appropriate curing reaction with the epoxy resin increases, and thus there is a possibility that a problem that the amount of the curing agent used is excessive occurs.
In addition, the weight average molecular weight (Mw) of the above polyamide resin may be 300 to 600g/mol or 400 to 500g/mol. When the weight average molecular weight of the polyamide resin is less than the above range, there is a problem of a decrease in compatibility with the epoxy resin, and when the weight average molecular weight of the polyamide resin exceeds the above range, there may occur a problem of a decrease in convenience of use and production efficiency due to an increase in viscosity of the polyamide resin.
The epoxy-modified amine compound can be produced by reacting an epoxy compound with an amine compound.
In this case, the epoxy compound may be a monoepoxy compound or a polyvalent epoxy compound, and examples thereof include: monoepoxy compounds such as butyl glycidyl ether, hexyl glycidyl ether, phenyl glycidyl ether, allyl glycidyl ether, p-tert-butylphenyl glycidyl ether, ethylene oxide, and propylene oxide; and polyvalent epoxy compounds such as bisphenol epoxy resins, novolak epoxy resins, ether ester epoxy resins, and glycidyl epoxy resins.
Examples of the amine compound include methylamine, ethylamine, propylamine, butylamine, ethylenediamine, propylenediamine, hexamethylenediamine, diethylenetriamine, ethanolamine, propanolamine, cyclohexylamine, isophoronediamine, aniline, dimethylamine, diethylamine, dipropylamine, dibutylamine, dipentylamine, dihexylamine, dimethanolamine, diethanolamine, and dipropanolamine.
The active hydrogen equivalent of the epoxy-modified amine compound may be smaller than the active hydrogen equivalent of the polyamide resin. As described above, by using two amine-based curing agents having different active hydrogen equivalent weights, the drying and curing rates can be controlled to ensure an appropriate coating film drying time and a sufficient pot life, thereby improving workability.
Specifically, the Active Hydrogen Equivalent Weight (AHEW) of the epoxy-modified amine compound may be 80 to 160g/eq or 100 to 140g/eq. When the active hydrogen equivalent of the epoxy-modified amine compound is less than the above range, there is a problem that rust inhibitive performance of the resulting coating film is lowered due to insufficient curing degree of the coating film, and when the active hydrogen equivalent of the epoxy-modified amine compound exceeds the above range, the required amount of the epoxy-modified amine compound for performing an appropriate curing reaction with the epoxy resin is increased, and therefore, there is a possibility that the use amount of the curing agent is increased and appearance characteristics of the resulting coating film are lowered.
The amine-based curing agent may be used in a range of 1:0.5 to 1:2 or 1:0.7 to 1:1.5 contains a polyamide resin and an epoxy-modified amine compound. When the mass ratio of the polyamide resin and the epoxy-modified amine compound is less than the above range, that is, when a small amount of the epoxy-modified amine compound is used based on the polyamide resin, there is a problem that it is difficult to control the pot life and workability of the coating material, and when the mass ratio of the polyamide resin and the epoxy-modified amine compound exceeds the above range, that is, when an excessive amount of the epoxy-modified amine compound is used based on the polyamide resin, there is a possibility that a problem that impact resistance and abrasion resistance of the resulting coating film are deteriorated occurs.
The content of the above amine-based curing agent may be 1 to 5 wt%, or 2 to 4 wt% with respect to the total weight of the epoxy resin composition. Specifically, the polyamide resin may be contained in an amount of 0.5 to 3% by weight or 1.5 to 2.5% by weight and the epoxy-modified amine compound may be contained in an amount of 0.5 to 3% by weight or 1.5 to 2.5% by weight, relative to the total weight of the epoxy resin composition.
When the content of the amine-based curing agent is less than the above range, there is a problem that the physical properties of the coating film prepared as a whole are not sufficient without curing at the time of preparing the coating film, and when the content of the amine-based curing agent exceeds the above range, since curing rapidly proceeds, there may occur a problem that the pot life is shortened and the long-term physical properties, such as rust prevention, of the prepared coating film are deteriorated. When the content of the polyamide resin is less than the above range, coating workability may be deteriorated and weather resistance of the coating film may be deteriorated, and when the content of the polyamide resin exceeds the above range, leveling (Leveling) of the coating film may be deteriorated and appearance may be deteriorated. When the content of the epoxy-modified amine compound is less than the above range, there is a problem that drying property is lowered under winter conditions, and when the content of the epoxy-modified amine compound exceeds the above range, there is a possibility that long-term weather resistance of the resulting coating film is deteriorated.
Pigment(s)
The epoxy coating composition may further comprise a pigment. At this time, the pigment plays a role of imparting color to the coating film prepared with the above composition.
The pigment may be, for example, a coloring pigment, an extender pigment, an antirust pigment, or a mixture thereof.
The coloring pigment described above plays a role of imparting color to the coating film while ensuring hiding power. In this case, the coloring pigment may be a black pigment, a white pigment, a blue pigment, a red pigment, a yellow pigment, a violet pigment, or a mixture thereof. In this case, the black pigment is not particularly limited as long as it is a generally known black pigment, and for example, carbon black, graphite, iron oxide, or a mixture thereof can be used. The white pigment is not particularly limited as long as it is a generally known white pigment, and for example, titanium dioxide (TiO) can be used2) And so on.
The extender pigment plays a role in improving the strength of the prepared coating film and adjusting the appearance characteristics and rheological property of the coating film. The extender pigment is not particularly limited as long as it is a generally known component, and for example, talc, barium sulfate, calcium carbonate, calcium silicate, a mixture thereof, or the like can be used.
The above rust inhibitive pigment plays a role in improving the rust inhibitive performance of the prepared coating film. The rust preventive pigment is not particularly limited as long as it is a generally known component, and examples thereof include zinc phosphate, zinc phosphate hydrate, aluminum phosphate, calcium hydrogen phosphate, zinc aluminum phosphate, strontium zinc phosphosilicate (phosphosilicate), calcium phosphate, strontium phosphosilicate, calcium borosilicate, and a mixture thereof.
The content of the above pigment may be 20 to 70% by weight or 30 to 50% by weight with respect to the total weight of the epoxy resin composition. Specifically, the above composition may contain 7 to 12% by weight of the coloring pigment, 2 to 8% by weight of the rust-preventive pigment, and 10 to 50% by weight of the extender pigment, relative to the total weight of the epoxy resin composition.
When the content of the pigment is less than the above range, long-term durability may be deteriorated, and defects may be generated in the appearance of the coating film, and when the content of the pigment exceeds the above range, coating workability may be deteriorated. When the content of the coloring pigment is less than the above range, there is a problem that the color of the coating film to be produced is different from the target color, and when the content of the coloring pigment exceeds the above range, the oil absorption is increased, and the workability of the coating material may be deteriorated. When the content of the rust inhibitive pigment is less than the above range, the rust inhibitive performance of the prepared coating film is insufficient, and when the content of the rust inhibitive pigment exceeds the above range, the amount of the rust inhibitive pigment used is large compared with the obtained effect, and there is a problem that the cost is unnecessarily increased. When the content of the extender pigment is less than the above range, the mechanical properties of the resulting coating film are insufficient, and when the content of the extender pigment exceeds the above range, the viscosity of the coating material becomes high, and the workability may be deteriorated.
Solvent(s)
The epoxy coating composition may further comprise a solvent. In this case, the solvent serves to adjust the viscosity of the coating composition to improve workability, adjust the drying rate, and adjust the content of Volatile Organic Compounds (VOC).
The solvent may include water and an organic solvent having compatibility with water. In this case, examples of the organic solvent having compatibility with water include alcohols and esters. Specifically, the organic solvent may include one or more selected from the group consisting of n-Propanol (n-Propanol), butoxyethoxyethanol (butoxyethoxyethanol), diethylene glycol monobutyl ether (DPnB), butoxyethanol (butoxyethanol), ethylene glycol monobutyl ether (Ethylene glycol monobutyl ether), dipropylene glycol butyl ether (DPnB), ethylene glycol monohexyl ether (Ethylene glycol monohexyl ether), n-hexanediol (n-hexyl glycol), dipropylene glycol n-butyl ether (Dipropylene glycol n-butyl ether), methoxypropanol (Methoxy Propanol), and Isopropanol (IPA).
In addition, the content of the above solvent may be 10 to 25% by weight or 13 to 20% by weight with respect to the total weight of the epoxy resin composition. Specifically, the above composition may include 9 to 20% by weight of water and 1 to 5% by weight of an organic solvent having compatibility with water, relative to the total weight of the epoxy resin composition.
When the content of the solvent is less than the above range, the viscosity of the composition is high, and workability of the composition is insufficient, and when the content of the solvent exceeds the above range, drying of the composition is slow at the time of preparing a coating film, and there is a possibility that quick drying and quick curing are not possible. When the water content is less than the above range, there is a problem that the coating workability of the paint is lowered and the appearance of the prepared coating film is not smooth, and when the water content exceeds the above range, the viscosity of the paint is low and a fluidity problem may occur at the time of coating work. In addition, when the content of the organic solvent is less than the above range, there is a problem that the appearance of the prepared coating film is deteriorated due to insufficient wettability of the coating material, and when the content of the organic solvent exceeds the above range, there is a possibility that the content of Volatile Organic Compounds (VOC) is increased.
Additive agent
The aqueous epoxy coating composition may further contain additives such as a dispersant, a surface conditioner, a pH adjuster, a thickener, an antifoaming agent, and an anticorrosive agent, and may further contain additives which can be usually added to the aqueous epoxy coating composition. In this case, the additives are not particularly limited as long as they are generally used in the aqueous epoxy coating composition.
As described above, the aqueous epoxy coating composition according to the present invention can be quickly dried and quickly cured at normal temperature, and thus can be used for outdoor (exterior) coating, and is excellent in workability and storage stability due to appropriate pot life. In addition, the coating film prepared using the above epoxy coating composition is excellent in mechanical properties such as adhesion, impact resistance, rust prevention and wear resistance.
The present invention will be described in more detail with reference to examples. However, these examples are only for assisting the understanding of the present invention, and the scope of the present invention is not limited to these examples in any sense.
[ examples ]
Examples 1 to 22 and comparative examples 1 to 8, epoxy coating compositions
Aqueous epoxy coating compositions were prepared by mixing the components according to the compositions shown in tables 1 to 4. At this time, IPA is isopropyl alcohol.
[ Table 1]
[ Table 2]
[ Table 3]
[ Table 4]
The manufacturers, product names, physical properties, and the like of the respective components used in the comparative examples and examples are shown in table 5 below.
[ Table 5]
Test examples: evaluation of physical Properties
The aqueous epoxy coating compositions of examples and comparative examples were coated to a dry film thickness of 45 μm and left to stand at room temperature for 60 minutes to form coating films. Then, the physical properties of the aqueous epoxy coating compositions of examples and comparative examples and the coating films prepared therefrom were measured by the following methods, and the results are shown in tables 7 to 10.
(1) Stability in storage
After the coating composition was left at 60 ℃ for 120 hours, the thickening of the coating composition, the precipitation of the pigment and the phase separation were visually evaluated.
Specifically, it was evaluated as excellent (. Circleincircle.) when there was no increase in viscosity of the paint, precipitation of the pigment and phase separation after storage, as good (. Largecircle.) when there was Soft (Soft) precipitation, i.e., precipitation of an extent of easy remixing, as normal (. DELTA.) when there was Soft precipitation and partial phase separation, and as bad (. Times.) when there was Hard (Hard) precipitation, i.e., precipitation of an extent of difficult remixing.
(2) Drying time (hr)
The epoxy coating composition was applied to a dry film thickness of 45 μm, dried at 25 ℃ or 10 ℃ and the drying time was measured according to ASTM D1640.
(3) Application time (hr)
After the epoxy coating composition was mixed, the change in viscosity of the mixed coating was measured with time while it was left at 40 ℃ and the time required for the change in viscosity (based on Zahn cup # 3) to exceed 10% of the initial viscosity was defined as the pot life.
(4) Initial water resistance
According to the CCIA (China Container industry Association) water-based coating specification, the epoxy coating composition is coated on an iron test piece subjected to surface sand blasting (SA 2.5) pretreatment by an Air spray method, and then dried for 1 day under the conditions of normal temperature (25 ℃) and low temperature (5 ℃). The dried test piece was immersed in a clean water tank (at least one week) until it was confirmed to be distinguishable, and the degree of generation of rust (ASTM D610) and blistering (ASTM D714) on the surface of the coating film was evaluated.
(5) Initial adhesion
In accordance with the method of the test for adhesive tape adhesion of ASTM D3359, 25 squares of 2 mm. Times.2 mm (transverse. Times.longitudinal direction) were formed on a test piece coating film by a cutter, and then the adhesive tape adhesion test was carried out on the squares, and the degree of peeling was measured to evaluate the adhesion.
At this time, the 25 squares were evaluated as 5B when 100% were completely adhered, 4B when 95% or more and less than 100% were remaining squares, 3B when 85% or more and less than 95% were remaining squares, 2B when 65% or more and less than 85% were remaining squares, 1B when 35% or more and less than 65% were remaining squares, and 0B when 35% or less than remaining squares were remaining squares.
(6) Initial impact resistance
According to ASTM D2794, a weight of 60lbs, 40lbs or 10lbs was dropped onto the front surface (epoxy-coated surface) of the test piece, and then the surface of the test piece was observed to evaluate the initial front surface impact resistance. At this time, the weight of the weight having no crack (crack) on the surface of the test piece was set as the initial front surface impact resistance.
Further, according to ASTM D2794, a 500g weight was dropped onto the rear surface (surface not coated with the epoxy coating composition) of the test piece at a height of 10 inches (inch) or more, and then the surface of the coating film was observed, and the maximum height at which cracks and peeling were not generated in the coating film was measured and was set as the initial rear surface impact resistance. The higher the height, the more excellent the physical properties were evaluated.
(7) Anti-flowing (Anti-bagging)
After coating an iron test piece with the coating composition by Airless spray (Airless spray), the coated coating was scraped in the horizontal direction to form a boundary line, and the test piece was placed at room temperature (25 ℃) in a direction perpendicular to the ground to grasp the extent of the coating in the boundary line portion.
Specifically, rating is 1 if there is no flow of paint, 2 if the borderline portion sags (waring), 3 if a portion of paint flows (slope bagging), 4 if there is a large amount of paint flowing (seal bagging), and 5 if the paint flows very severely and the borderline portion completely overlaps (Collapsed).
(8) Appearance characteristics
After coating the coating composition in accordance with the CCIA (China Container industry Association) aqueous coating standard, the appearance level of the surface of the coating film formed by drying under conditions similar to those of the actual coating line was evaluated.
The main evaluation items are: pinholes (Pinhole) exposed on the surface of the coating film, dewetting (De-wetting) caused by insufficient wetting of the substrate, and Inner pinholes (Inner Pinhole) hidden in the coating film. In general, visual inspection was performed using a magnifying glass of 15 times or more depending on the size, frequency, and the like of the coating film defects, and specific inspection standards are as shown in table 6 below.
[ Table 6]
(9) Rust (rusty) production: rust preventive Property 1
The rust inhibitive performance was evaluated by visually measuring the overall degree (%) of occurrence of rust, such as the magnitude and frequency of occurrence of rust, according to ASTM D610.
(10) Blister generation (bilster): rust resistance-2
The rust inhibitive performance was evaluated by visually observing the size and frequency of blister generation according to ASTM D714 and numerically expressing the values.
(11) Cause rust creep (rusty)Street): rust resistance-3
The rust inhibitive performance was evaluated with an average value obtained by measuring the distance (mm) penetrated from the cut at intervals of 1cm after 8 times of treatment (8 weeks) for 1 time after cutting 2 inches in the horizontal direction and 3 inches in the vertical direction with Sup>A knife for Sup>A coated test piece with Sup>A cut having Sup>A width of 1mm and repeating 3 days for ASTM G53 cycle (exposure to UV-Sup>A at 60 ℃ at 340nm for 8 hours, followed by condensation of moisture at 50 ℃ for 4 hours), then 4 days for accelerated corrosion cycle (spraying Sup>A solution of 0.35 wt% ammonium chloride and 0.05 wt% sodium chloride in deionized water at ph5.0 to 5.4 at 30 ℃ for 4 hours, followed by condensation of moisture at 40 ℃ for 2 hours) for 1 time according to ASTM D1654. The lower the value, the more excellent the physical properties were evaluated.
(12) Adhesion Property
The test piece coating film was exposed for 8 weeks (1,344 hours) at the same test cycle as in item (11), and then the adhesion was evaluated in the same manner as in item (5).
(13) Impact resistance
The test piece coating film was exposed for 8 weeks (1,344 hours) at the same test cycle as in item (11), and then the impact resistance was evaluated in the same manner as in item (6).
(14) Wear resistance
The abrasion resistance was evaluated by measuring the degree of abrasion (mg) according to ASTM D4060 using an abrasion tester (using a CS-17 abrasive wheel (abrading wheel) using a 5155 abrasive (abraser) from Taber corporation). The lower the value, the more excellent the physical properties were evaluated.
[ Table 7]
[ Table 8]
[ Table 9]
[ Table 10]
From the results of the above tables 7 to 10, it was confirmed that the physical properties were excellent as a whole when the coating compositions according to examples 1 to 22 of the present invention were applied.
In contrast, when the coating compositions of comparative examples 1 to 8, which deviate from the composition according to the present invention, were applied, the measured items showed deteriorated physical properties as a whole, as compared to the coatings of examples.
Specifically, in the case of comparative example 1 in which the first epoxy resin was not used, the drying time and the pot life became long, and the appearance characteristics became poor. In addition, in the case of comparative example 2 in which the second epoxy resin was not used, the drying time and heating time were shortened, and the storage stability was deteriorated, while in the case of comparative example 3 in which the vinyl aromatic oligomer was not used, the initial water resistance and impact resistance were deteriorated. Further, in the case of comparative example 4 using the first epoxy resin-5 having a glass transition temperature of less than 10 ℃, workability was deteriorated due to the longer drying time, while in the case of comparative example 5 using the first epoxy resin-6 having a glass transition temperature of more than 50 ℃, appearance characteristics were deteriorated. In addition, in the case of comparative example 6 using the second epoxy resin-5 having a glass transition temperature of less than-10 ℃, workability was insufficient because of the long pot life, while in the case of comparative example 7 using the second epoxy resin-6 having a glass transition temperature of more than-1 ℃, the flow resistance was deteriorated. Finally, in comparative example 8 in which an isocyanate-modified epoxy resin was used instead of the polyalkylene glycol-modified epoxy resin as the second epoxy resin, the compatibility with the bisphenol a type epoxy resin was poor, and the physical properties were deteriorated as a whole.
Claims (5)
1. A water-based epoxy coating composition characterized by comprising a first epoxy resin, a second epoxy resin, a vinyl aromatic oligomer and an amine-based curing agent,
wherein the first epoxy resin has a glass transition temperature of 20 to 40 ℃,
the second epoxy resin comprises a polyalkylene glycol-modified epoxy resin having a glass transition temperature of-10 to-1 ℃.
2. The waterborne epoxy coating composition of claim 1,
the first epoxy resin comprises a bisphenol A type epoxy resin having an epoxy equivalent of 800 to 1200g/eq,
the second epoxy resin has an epoxy equivalent of 850 to 1250g/eq.
3. The aqueous epoxy coating composition of claim 1,
the glass transition temperature of the vinyl aromatic oligomer is-5 to 6 ℃, and the weight average molecular weight of the vinyl aromatic oligomer is 1000 to 2000g/mol.
4. The waterborne epoxy coating composition of claim 1,
the amine curing agent comprises polyamide resin and an epoxy modified amine compound.
5. The waterborne epoxy coating composition of claim 1,
comprising 15 to 35% by weight of a first epoxy resin, 5 to 15% by weight of a second epoxy resin, 0.5 to 5% by weight of a vinyl aromatic oligomer and 1 to 5% by weight of an amine-based curing agent.
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| JP2008247958A (en) * | 2007-03-29 | 2008-10-16 | Dic Corp | Aqueous epoxy resin composition |
| US20100190916A1 (en) * | 2007-01-05 | 2010-07-29 | Nihon Tokushu Toryo Co., Ltd. | Coatings composition having vibration-damping of two-components type and coating type which can be cured at normal temperature |
| JP2017179107A (en) * | 2016-03-30 | 2017-10-05 | 新日鉄住金化学株式会社 | Aqueous epoxy emulsion composition and anti-corrosive paint |
| CN108047431A (en) * | 2017-12-28 | 2018-05-18 | 中科院广州化学有限公司 | A kind of aqueous epoxy emulsion, aqueous epoxide resin paint and preparation method thereof |
| CN112300616A (en) * | 2019-07-29 | 2021-02-02 | 株式会社Kcc | Water-soluble coating composition |
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| JP3995285B2 (en) * | 1996-04-26 | 2007-10-24 | 日本ペイント株式会社 | Method for producing resin dispersion for cationic electrodeposition coating |
| KR101392471B1 (en) | 2012-01-06 | 2014-05-15 | (주)감로파인케미칼 | Eco-functional compositions of primer paint having two component type and the method of producing the same |
| KR102293684B1 (en) * | 2020-03-06 | 2021-08-26 | 주식회사 케이씨씨 | Water-soluble epoxy resin, preparing method thereof and water-soluble primer composition the same |
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| US20100190916A1 (en) * | 2007-01-05 | 2010-07-29 | Nihon Tokushu Toryo Co., Ltd. | Coatings composition having vibration-damping of two-components type and coating type which can be cured at normal temperature |
| JP2008247958A (en) * | 2007-03-29 | 2008-10-16 | Dic Corp | Aqueous epoxy resin composition |
| JP2017179107A (en) * | 2016-03-30 | 2017-10-05 | 新日鉄住金化学株式会社 | Aqueous epoxy emulsion composition and anti-corrosive paint |
| CN108047431A (en) * | 2017-12-28 | 2018-05-18 | 中科院广州化学有限公司 | A kind of aqueous epoxy emulsion, aqueous epoxide resin paint and preparation method thereof |
| CN112300616A (en) * | 2019-07-29 | 2021-02-02 | 株式会社Kcc | Water-soluble coating composition |
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